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https://www.noaa.gov/media/digital-library-photo/pl23nur09529jpgDescription
An early diving bell used by 16th Century divers during salvage operations. Thebook this came from is a text on ship salvage and includes diving information.In: Regola generale di soleuare ogni fondata naue & nauilii con ragione byNiccolo Tartaglia. (Image credit: OAR/National Undersea Research Program (NURP))